Improvement in machines for threading and cutting off pipes



-2 Shengsheet 1.

L. W. STOCKWELL. f l Machine for'vThreading and Cutting Off Pipes.

i No] 217,302. Patented July 8,1879.

5 Y S. mm

' MWMM l mwmw N. PEERS, FHOTO-LITHOGRAPHEH. WASHINGTON. D. C.

2 `Sheets-[Sheet 2. L. W. STOOKWELL. Machine for Threading and Cutting'Off Pipes.v

No. 217,302. Patented July 8,1879..

MPEIERS, PHOTO-LITHOGRAPHER. WASHINGTON n C UNITED STATES I|?./. .TENTOEETcE.

LEVI w. sTooKwELL; on RAVENNA, onto.

IMPROVEMENT IN MACHINES FOR THREADING AND CUTTING OFF PIPES.

Specification forming part of Letters Patent No. 217,302, dated July 8,1879; application iiled June 1, 1878.

To all lwhom it may concern:

Be it known that I, LEVI W. STOGKWELL, of Ravenna, Portage county, Ohio,have invented a new and useful Improvement in Machines for Threading andCutting Oif Gas Pipes, which improvement is fully set forth in thefollowing specification. v

The drawings hereto annexed, consisting of two sheets, form a part ofthis specification.A

The object of my invention is to facilitate the placing of thethreading-dies in the machine in the proper position with reference tothe cams which move them to adjust the movement and positions of thecams, and to cut off the pipe by means of a cutting-tool having`akthreaded shank. f

Flgure l is a front view of the machine. Fig. 2 is a sectional view.Fig. Sis a section. Fig. 4 is a side view of part of the machine. Fig. 5shows the inner' end of guide s.

The handles h h are attached to opposite sides of the circular frame a,with which all the operatin g parts are connected.

The cani-rings e and i are placed against the ends of frame a, withtheir concentric cams in the circular grooves b d, and held in posi-,tion by face-plates g and p, so that the cams The cams enter notches inthe dies and guides.

The cutting-oit tool o rests in a groove in the side of guide sl, nearits inner end, Fig. 5, and the threaded shank w of tool o extendslengthwise through guide s, which is grooved an d shaped at c to receivethe threaded Tool o is fed to out oftl pipe by turnA ing screw-nut a4.

The guides s s s1 are placed a little out of radial line, so that toolo` will bein proper position to cut pipe.

When the threading-dies m m on m are to be operated, tool o should bewithdrawn by screwnut a4 within guidesl.v

rlhe guides s s s* are moved in against the pipeto be threadedby turningcam-ring t' by its handle Z. Cam-ring i is then held in, position byturning nut a on screw c2, Fig. 2, and thus pressing bar x firmlyagainst the cam-ring z'. The dies m m m m are then moved in tillproperly adjusted for threading the pipe by turning cam-ring c by itshandle k, and are held in position by tightening nut 4 w ou screw c2against bar fr.

The slotted gage or stop c should then be placed with its projection olin contact with pin o2 on the circumference of cam-ring c, and firmlyfastened by turning thumb-screw t. 4

When the pipe has been threaded the dies are-withdrawn by loosening nutfw and turning cam-ring c.

Otherpipes of the same size may be threaded without readjusting the diesby simply turning cam-rin g c till its pin o2 is in contact withprojection 0 of gage c. l

When the dies are operating, the guides s s sl keep them at right anglesto the pipe, so as to cut a true and uniform thread.

In cutting oif pipe, guide s1, being with the other guides iu contactwith the pipe, forms a iirin support for tool o close to the pipe.

There is suflicent space between each cain and its adjacent cam oncam-ring c to permit the dies to be withdrawn from frame a, whencam-ring chas been turned till the cams are out of the notches in thedies. This can be done by moving bar a: away from cam-rin g csufficiently to permit shoulder e on the camring to pass under bar m, asshown iu Fig..3. The dies are. prevented from becoming dislodged fromthe cams while the machine is in operation by the contact of shoulder ewith bar x. Guide sl may be removed in a similar manner.

When the dies are being placed iu the machine, a piu or projection, s2,on one side of each die m, at the back side of the notch which the camenters, by contact with the cam, Fig.

3, arrests the die at the proper position for the cam to enter it.

I claim as my inventionl. The adjustable cam-ring c, provided withshoulder e, and having spaces between the ends of the cams Jfor thepassage of the dies, in combination with stop-bar m and the dies m,provided with thumb-screw w', by which it may be rendereddisengageablewith shoulder e, substantially as described.

2. The die m, having a side projection, s2, at the notch whichis'entered by the cam on camring c, in combination with the cam-ring andthe frame a, substantially as described.

LEVI W. STOCKWELL.

Witnesses:

GEO. F. RoBrNsoN, BRADFORD HoWLAND.

